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#17 The one thing I thought I remembered from my long, long ago Organic Chem class was that Octane was the percent of a certain type of Carbon ring and therefore it couldn't ever be higher than 100. The prof claimed that anything higher was marketing hype. This was back in the days of "Keotane" rating from, I think, Sunoco.

#18 But reforms cannot be delayed for long, economists say. "Fuel shortages are a symptom of the strains on Egypt's unsustainable subsidy system," said Simon Kitchen, an economist at EFG-Hermes in Cairo.

#19 You got me curious, Alanc - For example, petrol with the same knocking characteristics as a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90.[2] A rating of 90 does not mean that the petrol contains just iso-octane and heptane in these proportions, but that it has the same detonation resistance properties. Because some fuels are more knock-resistant than iso-octane, the definition has been extended to allow for octane numbers higher than 100.

#20 Once upon a time, a co-worker dumped about 5 gallons of 115/145 AVGAS into his F150 tank ( said there was aleady 15 gallons of pump gas in it) about 2 days later he had the nicest small block paperweight in the neighborhood. Ford Blue and everything......
i limit my hi octane in my motorsporting to the 93 ; works just fine.

#28 Slightly off topic: I don't know what happened to USN,Ret's neighbor but since higher octane burns slower (resists detonation) than the regular gas you need to address timing and jetting when using 115 octane race gas. Gives a longer duration thrust for a given power cycle and lets the engine run cooler if the engine is properly set up. Cooling was why high performance (especially air-cooled) aircraft engines were designed for up to 130 octane fuels.

Want to grenade an engine? Use gasohol in an engine not designed for it and/or in an infrequently used motorcycle or classic car. Cuts oil films, gathers moisture in heads, bores, bearings (promotes rust), rots fuel lines and pump diaphragms not designed for alcohol.

#29 Tipover, While it was many years ago, i think the reson Tom's motor seized was because he did mess with the timing and it ran hot. he had been using smaller amounts of this AVGAS for some time. it was during the 70's oil embargo and the gas was from the daily fuel samples out of our station S-2's and T-28's. wonder if the high lead content helped?

#31 "...Egypt was a corrupt socialist state during Mubarak's reign..." - Zhang Fei

Actually, they were moving away from socialism with some govt industries sold and others transferred to various private consortia. Unfortunately, the cronyism was pretty obvious and friends of Mubarek ended up with stuff at very favorable terms and other friends of Mubarek ended up with sweet commissions for their role in the transaction. This gave capitalism (or liberalism) a bad name.